98 ASCAROIDEA 



Female genital tubes paired, the anterior branch vestigial. 

 Caudal glands present. 



Hab. Marine. 



Genotype : 0. [Oxystoma] elongatum (Biitschli, 1874). 



Biitschli, 1874, Abh. Senckenb. Ges., Frankfurt a. M., 

 ix, 270; Southern, 1914, Proc. R. Irish Acad., xxxi, 18. 



19. Litonema Cobb, 1920. 



Cuticle finely striated, without bristles. Lateral alae 

 present. Head without bristles. Lips not apparent. Lateral 

 organs pore-like or perhaps absent. A very narrow, elongate 

 buccal capsule possibly present. Oesophagus slightly ex- 

 panded posteriorly. Genital organs undescribed. 



Hab. Fresh water (swamp). 

 Genotype : L. nudum Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 237 and key. 



20. Hyalaimus Cobb, 1920. 



Cuticle with irregular markings and finely crenate contour. 

 Lateral fields broad, granular, with finely crenulate alae. 

 Head truncate, without bristles. Lips indistinct. A crown 

 of six cephalic papiUae present. Lateral organs absent. 

 Oesophagus with an anterior (" pharyngeal ") swelling, and 

 fusiform posteriorly. Male undescribed. Tail of female 

 conical, pointed. Female genital tubes paired, opposed, 

 outstretched. 



Hab. (Apparently a single specimen) in the intestine of an 

 Earthworm (Australia). 



Genotype : H. brevicollis Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 238 and key. 



21. Macroposthonia de Man, 1880. 



Cuticle striated, apparently without bristles. Lateral alae 

 present. Head without lips or bristles. Lateral organs not 

 described. Oesophagus indistinctly separated from intestine. 

 Tail of male completely surrounded by broad, bursa-like alae. 

 Caudal pai)illae absent. Spicules slender, extremely long. 

 No accessory piece. Caudal glands absent. Female unknown. 



Hab. Soil. 



Genotype : M. annulata de Man, 1880. 



de Man, 1880, Tijdschr. Nederl. dierk. Vereen., Leiden, 58; 

 1884, Die frei . . . lebenden Nematoden der Niederl. Fauna, 

 124; Micoletzky, 1922, Arch. f. Naturg., Abt. A, Ixxxvii, 163. 



